该程序主要用于计算河床断面间距及河段总长度。根据每一个断面测点的平面坐标，可以得到每一个河床断面之间的间距，同时得到河段的总长度。需要输入的是断面左右的平面坐标。-The main procedures used to calculate the distance between river sections and the total length of river. According to the measuring point of each section of the plane c